Collection
- A.B. Stickney, Compiler, Genealogical Materials1
- A.J. Morrison Collection1
- A.S. Hammack papers2
- Aaron Chipps, Coal Miner, Papers1
- Abbye A. Gorin Architectural Collection2
- Abraham Anson papers14
- Abraham Lincoln Collection1
- Academic Departments - Record Group 97
- Ackerly Family Papers16
- Ada Haldeman Ford, Suffragist, Papers1
- Adalbert J. Volck Collection of Etchings4
- Adam Empie Papers3
- Adams T. Rice papers4
- Addison H. Smith papers3
- Additional Henry Hughes Presler Papers ca. 1909-19651